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diff --git a/src/DotNetOpenAuth.ApplicationBlock/CustomExtensions/Acme.cs b/src/DotNetOpenAuth.ApplicationBlock/CustomExtensions/Acme.cs
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+++ b/src/DotNetOpenAuth.ApplicationBlock/CustomExtensions/Acme.cs
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+//-----------------------------------------------------------------------
+// <copyright file="Acme.cs" company="Outercurve Foundation">
+//     Copyright (c) Outercurve Foundation. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.ApplicationBlock.CustomExtensions {
+	using System;
+	using System.Collections.Generic;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.OpenId.ChannelElements;
+	using DotNetOpenAuth.OpenId.Messages;
+	using DotNetOpenAuth.OpenId.Provider;
+	using DotNetOpenAuth.OpenId.RelyingParty;
+
+	/// <summary>
+	/// A sample custom OpenID extension factory.
+	/// </summary>
+	/// <remarks>
+	/// OpenID extension factories must be registered with the library.  This can be
+	/// done by calling <see cref="Acme.Register"/>, or by adding a snippet
+	/// such as the following to your web.config file:
+	/// <example>
+	///   &lt;dotNetOpenAuth&gt;
+	///     &lt;openid&gt;
+	///       &lt;extensionFactories&gt;
+	///         &lt;add type="DotNetOpenAuth.ApplicationBlock.CustomExtensions.Acme, DotNetOpenAuth.ApplicationBlock" /&gt;
+	///       &lt;/extensionFactories&gt;
+	///     &lt;/openid&gt;
+	///   &lt;/dotNetOpenAuth&gt;
+	/// </example>
+	/// </remarks>
+	public class Acme : IOpenIdExtensionFactory {
+		internal const string CustomExtensionTypeUri = "testextension";
+		internal static readonly Version Version = new Version(1, 0);
+
+		public static void Register(OpenIdRelyingParty relyingParty) {
+			if (relyingParty == null) {
+				throw new ArgumentNullException("relyingParty");
+			}
+
+			relyingParty.ExtensionFactories.Add(new Acme());
+		}
+
+		public static void Register(OpenIdProvider provider) {
+			if (provider == null) {
+				throw new ArgumentNullException("provider");
+			}
+
+			provider.ExtensionFactories.Add(new Acme());
+		}
+
+		#region IOpenIdExtensionFactory Members
+
+		/// <summary>
+		/// Creates a new instance of some extension based on the received extension parameters.
+		/// </summary>
+		/// <param name="typeUri">The type URI of the extension.</param>
+		/// <param name="data">The parameters associated specifically with this extension.</param>
+		/// <param name="baseMessage">The OpenID message carrying this extension.</param>
+		/// <param name="isProviderRole">A value indicating whether this extension is being received at the OpenID Provider.</param>
+		/// <returns>
+		/// An instance of <see cref="IOpenIdMessageExtension"/> if the factory recognizes
+		/// the extension described in the input parameters; <c>null</c> otherwise.
+		/// </returns>
+		/// <remarks>
+		/// This factory method need only initialize properties in the instantiated extension object
+		/// that are not bound using <see cref="MessagePartAttribute"/>.
+		/// </remarks>
+		public IOpenIdMessageExtension Create(string typeUri, IDictionary<string, string> data, IProtocolMessageWithExtensions baseMessage, bool isProviderRole) {
+			if (typeUri == CustomExtensionTypeUri) {
+				return isProviderRole ? (IOpenIdMessageExtension)new AcmeRequest() : new AcmeResponse();
+			}
+
+			return null;
+		}
+
+		#endregion
+	}
+}